(Table 1, pages 646) Uranium analyses of selected manganese nodules from the Atlantic and Pacific oceans and Lake Charlotte, Canada, supplement to: Mo, T; Suttle, C A; Sackett, William M (1973): Uranium concentrations in marine sediments. Geochimica et Cosmochimica Acta, 37(1), 35-51


Uranium concentrations in a large number of marine sediment samples of different types with world-wide spatial distribution have been determined using the rapid, precise and nondestructive technique of counting the delayed neutrons emitted during U235 fission induced with thermal neutrons. Several interesting relationships were apparent. 1) A direct proportionality was observed between percentage of organic carbon and uranium in sediments deposited in an anoxic environment in the Pettaquamscutt River in Rhode Island with concentrations ranging from 7 per cent organic carbon and 7 ppm uranium to 14 per cent organic carbon and 30 ppm uranium. A similar relationship was found in cores of sediments deposited on the Sigsbee Knolls in the Gulf of Mexico. 2) For manganese nodules a direct relationship can be seen between uranium and calcium concentrations and both decrease with increasing depth of deposition. For nodules from 4500 m in the Pacific, concentrations are 3 ppm uranium and 0.3 per cent calcium compared with 14 ppm uranium and 1.5 per cent calcium at 1000 m. 3) Relatively high uranium concentrations were observed in carbonates deposited in the deepest parts of the Gulf of Mexico, with the >88 ? carbonate fraction in Sigsbee Knoll cores having as much as 1.20 ppm. A model to explain the observed variations must include uranium enrichment in near shore environments via an anoxic pathway, followed by redeposition in a deep ocean environment with dilution either by low-uranium-bearing foraminiferal or silicious oozes or, along the continental margins, dilution with high-uranium-bearing carbonate sands.

1N HCL leachate was analysed. Average standard deviation is 11%.

DOI https://doi.org/10.1594/PANGAEA.872386
Related Identifier https://doi.org/10.1016/0016-7037(73)90242-1
Related Identifier https://doi.org/10.7289/V52Z13FT
Related Identifier https://doi.org/10.7289/V53X84KN
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.872386
Creator Mo, T; Suttle, C A; Sackett, William M
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1973
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 64 data points
Discipline Earth System Research
Spatial Coverage (-171.000W, -41.983S, 51.900E, 44.773N); Pacific Ocean; Atlantic Ocean; Indian Ocean; Blake Plateau, Atlantic Ocean; Canada
Temporal Coverage Begin 1950-09-02T00:00:00Z
Temporal Coverage End 1965-08-26T00:00:00Z